Note: "fee64a58-2e36-43f5-962d-8c33f936d452" UUID would be different for every PC. Use your one here.
Save and exit

reboot

Extra goodies

Enable Laptop mode to save power and lower CPU temp:

leafpad /proc/sys/vm/laptop_mode

If you have 0 in the file, that means laptop mode is disabled.

Replace the number with 5.

Save and exit.

Automated Script

Our user 'skysploit' created this fantastic script to automate the whole process (except modifying grub.cfg file). Download the script, save anywhere
amdinstall_kali_linux.sh
Make it executable and run it: